From Soaplife:

With word Stuart Laing's character Rob is for the axe and Leonard Fenton is to return as Dr Legg, speculation is Dr May (Amanda Fenton) will leave the screen with Rob after discovering she's having his baby.. Which would leave Dawn with a baby she can't sell!

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I can't see this myself. I don't think Rob would want to be around whilst she's bringing a baby up, seeing as she's been so controlling of him recently. I can't see them washing their hands of Dawn, May especially, given it was her idea to buy the baby and she's miscarried before, so she could end up with no baby if she does wash her hands of Dawn.